68K to PowerPC in 1994-1998, on to Intel in 2006-2009, and to Apple silicon from 2020. The 68K emulator, Rosetta, and Rosetta 2 that enabled backward compatibility.
Apple silicon
How much faster are the P cores in M3 and M4 chips, compared to late Intel Macs? How do they compare when running threads at low QoS, such as those of macOS background tasks?
From the original Macintosh 128K in 1984, through the divergence into SE and Mac II, then the unique Twentieth Anniversary Mac, to the first iMac in 1998, and its successors.
How apps and processes set their priority, and on Apple silicon that determines which type of core they can be run on. What you can do to alter that.
Why is an M2 Pro or Max preferable to an M1 Pro or Max? Is 8 GB of memory sufficient? Can I extend the internal SSD with an external drive? Can I buy and upgrade?
In a VM hosted on an M4, upgrading 14.7.5 to 15.4.1 took an 8.7 GB download and worked. From 15.1 to 15.4.1 took over 15 GB and failed with a kernel panic.
Intel Macs tell you why they last shut down, in the ‘shutdown cause code’ written to the log by their System Management Controller. What do Apple silicon Macs do?
A round-up of firmware updates across 15.4, 14.7.5 and 13.7.5, prospects for future macOS and firmware updates, and problems updating to 15.4.
Is it possible to update a VM running macOS Sequoia to version 15.4? Three attempts, three failures. And why are all those file creation dates wrong?
Systematic and thorough account of the structure and function of bootable external disks and dual-boot systems from High Sierra to Sequoia, and how to diagnose their problems.
The Eclectic Light Company 